diff --git a/lib/rules/unit-no-unknown/__tests__/index.js b/lib/rules/unit-no-unknown/__tests__/index.js
index cc25bbddbf..8e21855e29 100644
--- a/lib/rules/unit-no-unknown/__tests__/index.js
+++ b/lib/rules/unit-no-unknown/__tests__/index.js
@@ -441,6 +441,10 @@ testRule(rule, {
     {
       code: "a { width: 1em; \n// width: 10pix\n }",
       description: "ignore wrong unit within comments"
+    },
+    {
+      code: "@56789a: #56789a;\na { color: @56789a; }",
+      description: "ignore variable names"
     }
   ],
 
diff --git a/lib/utils/getUnitFromValueNode.js b/lib/utils/getUnitFromValueNode.js
index 88acd42e43..ecb29fcb78 100644
--- a/lib/utils/getUnitFromValueNode.js
+++ b/lib/utils/getUnitFromValueNode.js
@@ -25,7 +25,7 @@ module.exports = function(node /*: Object*/) /*: ?string*/ {
 
   if (
     node.type !== "word" ||
-    !isStandardSyntaxValue(value) ||
+    !isStandardSyntaxValue(node.value) ||
     !_.isFinite(parseInt(value)) ||
     node.value[0] === "#"
   ) {